37 Cancri

37 Cancri

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cancer
Right ascension	08^h 38^m 05.17248^s[1]
Declination	+09° 34′ 28.6006″[1]
Apparent magnitude (V)	6.542[2]
Characteristics
Evolutionary stage	main sequence[3]
Spectral type	A1 V[4][5]
B−V color index	−0.010±0.006[6]
Astrometry
Radial velocity (Rv)	+22.1±2.2[6] km/s
Proper motion (μ)	RA: −28.271[1] mas/yr Dec.: −4.237[1] mas/yr
Parallax (π)	6.5093 ± 0.0735 mas[1]
Distance	501 ± 6 ly (154 ± 2 pc)
Absolute magnitude (MV)	1.30[6]
Details
Mass	2.66±0.05[3] M☉
Radius	1.8[7] R☉
Luminosity	30.9+3.0 −2.7[2] L☉
Surface gravity (log g)	4.30[2] cgs
Temperature	9,830[2] K
Metallicity [Fe/H]	−0.21±0.13[2] dex
Rotational velocity (v sin i)	35.2±1.1[2] km/s
Other designations
37 Cnc, BD+10°1840, HD 73316, HIP 42353, HR 3412, SAO 116975[5]
Database references
SIMBAD	data

37 Cancri is a star in the zodiac constellation of Cancer. It is a challenge to view with the naked eye, having an apparent magnitude of 6.54.^[2] The star is moving away from the Earth with a heliocentric radial velocity of +22 km/s, having come as close as 246 light-years some 2.7 million years ago.^[6]

This is an ordinary A-type main-sequence star with a stellar classification of A1 V,^[4] which indicates it is generating energy through hydrogen fusion at its core. It is spinning with a projected rotational velocity of 35 km/s.^[2] The star has 2.7^[3] times the mass of the Sun and around 1.8^[7] times the Sun's radius. It is radiating 31 times the luminosity of the Sun from its photosphere at an effective temperature of 9,830 K.^[2]

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. Royer, F.; et al. (February 2014), "Normal A0-A1 stars with low rotational velocities. I. Abundance determination and classification", Astronomy & Astrophysics, 562: 21, arXiv:1401.2372, Bibcode:2014A&A...562A..84R, doi:10.1051/0004-6361/201322762, S2CID 54511685, A84.
3. Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
4. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
5. "37 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-01.
6. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.